CN112908496A - Small-size annular cooling structure suitable for cascade arc ion source - Google Patents
Small-size annular cooling structure suitable for cascade arc ion source Download PDFInfo
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- CN112908496A CN112908496A CN201911135268.5A CN201911135268A CN112908496A CN 112908496 A CN112908496 A CN 112908496A CN 201911135268 A CN201911135268 A CN 201911135268A CN 112908496 A CN112908496 A CN 112908496A
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- 238000001816 cooling Methods 0.000 title claims abstract description 105
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 228
- 230000007704 transition Effects 0.000 claims description 29
- 238000009434 installation Methods 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 2
- 230000004927 fusion Effects 0.000 abstract description 5
- 239000011148 porous material Substances 0.000 abstract description 4
- 239000002826 coolant Substances 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 abstract description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 abstract 2
- 235000017491 Bambusa tulda Nutrition 0.000 abstract 2
- 241001330002 Bambuseae Species 0.000 abstract 2
- 235000015334 Phyllostachys viridis Nutrition 0.000 abstract 2
- 239000011425 bamboo Substances 0.000 abstract 2
- 230000000694 effects Effects 0.000 description 10
- 238000003466 welding Methods 0.000 description 10
- 239000000498 cooling water Substances 0.000 description 6
- 238000013461 design Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 238000005219 brazing Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21B—FUSION REACTORS
- G21B1/00—Thermonuclear fusion reactors
- G21B1/11—Details
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/10—Nuclear fusion reactors
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Abstract
The invention belongs to a magnetic confinement nuclear fusion technology, in particular to a small-size annular cooling structure suitable for a cascade arc ion source, which comprises a cooling sleeve main body, a water inlet annular dry flow pipe and a water outlet annular dry flow pipe; cooling jacket main part tubular structure, be equipped with a N income water hole and a N apopore along the vertical direction of section of thick bamboo wall in the section of thick bamboo wall, cooling jacket main part barrel lower extreme is equipped with a N intercommunication portion, it communicates adjacent income water hole and apopore, the inside wall of income water hole/apopore all arranges there is pore wall spiral rib, the high temperature water that will be close to inner wall one side through spiral rib constantly exchanges with the low temperature water that is close to outer wall one side, for the water route of smooth wall, can increase substantially the heat exchange efficiency of coolant, reduce the structure highest temperature, the heat deposit of the inside and outside region of balanced cooling jacket.
Description
Technical Field
The invention belongs to a magnetic confinement nuclear fusion technology, and particularly relates to a small-size annular cooling structure suitable for a cascade arc ion source.
Background
The divertor is used as a key component of a future fusion reactor, the divertor directly faces to the surface of a component of plasma, the divertor can operate in the environment of strong particle flow and high thermal load, and great requirements are provided for surface materials, cooling structure design and the like. Plasma density in the divertor region of current tokamak devices (-10)21/m3) And ion flux (10)24/m3～1025/m3) All are far lower than the level of a future fusion reactor, and the characteristic research of the interaction between plasma and materials cannot be carried out under the environment, so that whether the plasma and the materials are suitable for serving as the surface materials of the divertor component of the future fusion reactor or not can be evaluated.
Linear plasma devices have been increasingly gaining attention as a characteristic study of the interaction between plasma and materials because of their simple structure, easy maintenance, and ability to generate high-density low-temperature plasma. In recent years, a plurality of linear plasma devices are gradually established in China, such as Sichuan university, nuclear industry southwest physical research institute, Beijing aerospace university and Chinese academy plasma institute. At present, a cascade arc ion source is generally adopted by a linear device and is used for generating required low-temperature plasma; to achieve higher plasma density and flux, larger voltage and current discharges are required to achieve higher power output. Although the output power of the ion source is greatly increased, the width of the air feed channel is still in the millimeter order, so that ionized low-temperature plasma can form strong plasma flow and high thermal load in the narrow pipeline space, and the ionized low-temperature plasma rapidly increases along with the increase of the discharge power, which seriously affects the service life of the ion source and also limits the discharge operation with higher plasma density.
Disclosure of Invention
The invention aims to provide a small-size annular cooling structure suitable for a cascade arc ion source, which can be used as a protective wall of a plasma discharge channel, quickly guide out the heat load deposited on the surface and prolong the service life of the ion source.
The technical scheme of the invention is as follows:
a small-size annular cooling structure suitable for a cascade arc ion source comprises a cooling sleeve main body, a water inlet annular dry flow pipe and a water outlet annular dry flow pipe, wherein the water inlet annular dry flow pipe and the water outlet annular dry flow pipe are arranged above the cooling sleeve main body and are communicated with a cooling channel of the cooling sleeve main body; the cooling sleeve main body is of a cylindrical structure, the cylinder wall of the cooling sleeve main body is of a certain thickness, 2N cooling channels are arranged in the cylinder wall along the vertical direction of the cylinder wall, the cooling channels comprise N water inlet holes and N water outlet holes, the water inlet holes and the water outlet holes are arranged at intervals, the water inlet annular dry flow pipe is communicated with the water inlet holes, and the water outlet annular dry flow pipe is communicated with the water outlet holes; the inlet hole and the adjacent water outlet hole are communicated with each other in the lower end of the cooling sleeve main body cylinder, namely N communicating parts are arranged at the lower end of the cooling sleeve main body cylinder and communicate the adjacent inlet hole and the water outlet hole.
The inner wall surfaces of the water inlet hole/the water outlet hole are all provided with hole wall spiral ribs which are uniformly distributed on the inner wall surface of the hole in the circumferential direction.
The twist ratio of the number of spiral ribs on the hole wall is 2-5, and the radial thickness of the ribs is 0.1-0.4 mm.
A transition structure is arranged above the cooling sleeve main body, 2N mounting through holes are formed in the transition structure, and N water inlet branch pipes and N water outlet branch pipes are arranged at the mounting through holes at intervals; the water inlet branch pipe is communicated with a water inlet annular main flow pipe above the water inlet branch pipe, and the water outlet branch pipe is communicated with a water outlet annular main flow pipe above the water outlet branch pipe; the water inlet branch pipe is communicated with a water inlet hole of the cooling sleeve main body below, and the water outlet branch pipe is communicated with a water outlet hole of the cooling sleeve main body below.
The water inlet branch pipe and the water outlet branch pipe are bent pipes which are bent outwards, and the height position of the water inlet branch pipe is larger than that of the water outlet branch pipe.
The inner diameter of the installation through hole on the transition structure is gradually changed to form a gradually changed through hole, the diameter of the large end of the installation through hole is the same as that of the water outlet hole/water inlet hole below the installation through hole, and the diameter of the small end of the installation through hole is the same as that of the water inlet branch pipe/water outlet branch pipe.
The outer sides of the water inlet annular dry flow pipe and the water outlet annular dry flow pipe are respectively provided with a water inlet pipe and a water outlet pipe which are correspondingly communicated with the water inlet annular dry flow pipe and the water outlet annular dry flow pipe.
The water outlet pipe and the water inlet pipe are annularly and upwardly distributed at an angle of 150-180 degrees.
The plane of the water outlet annular main flow pipe is parallel to the plane of the water inlet annular main flow pipe, and the circle center is at a certain distance.
The cooling sleeve main body is annularly and evenly provided with six water inlet holes and six water outlet holes to form six parallel double-hole loops.
The invention has the following remarkable effects:
high-temperature water close to one side of the inner wall and low-temperature water close to one side of the outer wall are continuously exchanged through the spiral ribs, so that the heat exchange efficiency of the coolant can be greatly improved, the highest temperature of the structure is reduced, and the heat deposition of the inner area and the outer area of the cooling sleeve is balanced relative to a water path with a smooth wall surface;
the water inlet holes and the water outlet holes are arranged alternately, heat deposition distributed in the circumferential direction of the cooling sleeve main body is balanced, structural thermal stress and deformation are reduced, and meanwhile, very small pressure loss is achieved.
Adopt transition structure installation water inlet branch pipe and water outlet branch pipe, and do not directly with water inlet/outlet channel direct connection to cooling jacket main part, be connected to the cooling jacket main part through transition structure in the middle of water inlet branch pipe and the water outlet branch pipe, be the main consideration: 1) the cooling jacket body structure is the core of the present application (the cooling jacket structure design space requirement is extremely narrow, only one annular region of space, the inside is the plasma space, the outside is the larger diameter annular region for the superconducting coil arrangement, which is why the water inlet/outlet branch pipe must extend out a certain length from the end); if the branch pipe is directly welded on the cooling sleeve main body, deformation control of the main body and quality of a circular pipe type welding seam are examined, and in order to avoid the risk, a transition structure is adopted for realizing; the thinnest part of the wall thickness of the cooling sleeve main body is less than or equal to 1.5mm, and the welding is difficult. 2) By adopting the transition structure, on one hand, the water inlet branch pipe/the water outlet branch pipe and the transition structure can be integrally formed, and then the transition structure is connected with the cooling sleeve main body by welding. And the assembly is simpler. On the other hand, the thickness of the welded branch pipe and the edge of the transition structure can be increased through the hole with the gradually changed diameter of the transition structure, so that the radial thickness of the welding surface of the branch pipe reaches about 2mm, the welding difficulty is reduced, and the branch pipe can be maintained and replaced more conveniently; 3) meanwhile, the welding contact area between the transition structure and the cooling sleeve main body is larger, and the welded interface is more stable. 4) The water pipe can be directly welded on the cooling sleeve main body, but the welding difficulty is improved, and the requirement on welding control is higher.
The transition structure is designed, in order to communicate the water inlet branch pipe/the water outlet branch pipe with the water inlet hole/the water outlet hole of the cooling sleeve main body, the adopted mounting hole is a gradual change through hole with gradually changed diameter, in the preferred embodiment, the diameter of the hole of the cooling sleeve main body is 4mm, the radial total thickness is 7mm (the inner diameter and the outer diameter are respectively 8 mm-15 mm), then the thinnest part is only 1.5mm, after passing through the transition structure with gradually changed diameter, the diameter of the hole is reduced to 3mm, the thickness of the thinnest part at one end after the transition structure is changed is 2mm, and the thickness is increased to provide better welding quality increasing possibility and a larger welding space for the water pipe.
The water inlet pipe and the water outlet pipe form an angle of 150-180 degrees on the ring shape through the structural design of the water inlet/outlet ring-shaped dry flow pipe. The closer the angle formed by the water inlet pipe and the water outlet pipe on the ring is to 180 degrees, the more uniform the overall cooling effect of the cooling structure is (namely, the smaller the difference between the highest temperature and the lowest temperature of the whole ring structure is). The more uniform the cooling effect, the higher the highest heat flow that can be borne by the inner wall of the cooling jacket body, and the better the cooling capacity with respect to other angles (after water is split from the main flow, the shortest path tends to be found and converged at the confluence, so that the shortest path has more water flowing through than the farthest path, which results in the better the cooling effect of the structure on the shortest path than the structure on the farthest path, and in order to avoid this effect, the distance of each path from the splitting port to the confluence port is adjusted as uniform as possible, i.e., after splitting, to the outlet confluence, the distance that water on each path runs through is kept as equal as possible), the better the protection of the structural stability (because, the smaller temperature gradient means less thermal stress, the damage to the structure is reduced). But the angle is not necessarily 180 degrees, the angle is designed to avoid the water outlet branch pipe and the water inlet branch pipe and is placed between the adjacent two water inlet branch pipes and the water outlet branch pipes, and 150-180 degrees are selected.
The distance between the communicating part at the lower part of the double-hole loop and the near end face of the main body is 2-4 mm (the numerical value is the minimum value selected as far as possible under the condition that the structural strength of the structural main body is ensured, the smaller the value is, the deeper the cooling water can reach in the axial direction, the more the cooling effect on the structural main body can be realized, and the cooling effect is improved), and the communicating height is 3-5 mm (preferably, the diameter of the hole of the cooling sleeve main body is selected, and more preferably, the value is 4 mm). The communicating part enables cooling water to flow into the water inlet hole through the water inlet branch pipe, then flow through the communicating part, enter the water outlet hole, flow into the outlet annular dry flow pipe through the water outlet branch pipe, and finally be led out. The cooling jacket main body is provided with a water inlet hole, a water outlet hole and a water outlet hole, wherein the water inlet hole, the water outlet hole and the water outlet hole are communicated with each other, and the water outlet hole is communicated with the water inlet hole and the water outlet hole.
The communicating part does not have a through hole directly penetrating through a hole adopted by technicians in the prior art as a design, because the average temperature rise degree of water entering from an inlet hole is smaller (the temperature rise is about 7 ℃ under the steady-state heat flow of 10MW/m 2) when the water reaches the communicating part after passing through the water inlet hole, if the communicating part is designed, the water is mixed by buffering at the communicating part and then returns to pass through a water outlet hole, the water is raised along with the smaller temperature rise, but the difference between the cooling effect of the water inlet hole and the cooling effect of the water inlet hole is not large, so that the design has no obvious reduction of the cooling capacity, and the two advantages that a, the water inlet pipe system and the water outlet pipe system are all arranged at one end of the cooling sleeve main body, the overall design can be integrated, and various experimental; b. half of requirements are reduced between the supply of cooling water, the economic benefit is improved, and the requirements on the power consumption and the capacity of the water pump are reduced.
The cooling jacket structure in the present application is capable of cooling 10MW/m2The above steady state high heat flow load.
Drawings
FIG. 1 is a schematic view of a small-scale annular cooling configuration suitable for use in a cascaded arc ion source;
FIG. 2 is a cross-sectional view of a cooling conduit of a small-scale annular cooling structure suitable for use in a cascaded arc ion source;
FIG. 3 is a schematic diagram of a basic repeating unit-diplopore circuit;
in the figure: 1. cooling the jacket body; 2. a transition structure; 3. a water inlet branch pipe; 4. an annular dry flow pipe for water inlet; 5. a water inlet pipe; 6. a water outlet branch pipe; 7. an annular dry flow pipe for water outlet; 8. a water outlet pipe; 9. a water outlet hole; 10. the wall of the hole is provided with spiral ribs; 11. a water inlet hole; 12. a dual bore loop.
Detailed Description
The invention is further illustrated by the accompanying drawings and the detailed description.
As shown in fig. 1, the cooling jacket main body 1 is a cylindrical structure with a certain wall thickness, the upper end of the cooling jacket main body is open, a transition structure 2 is installed on the cooling jacket main body, and a plurality of water inlet branch pipes 3 and water outlet branch pipes 6 with the same number are installed and processed on the transition structure 2 at intervals. The water inlet branch pipe 3 and the water outlet branch pipe 6 are respectively communicated with a water inlet annular main flow pipe 4 and a water outlet annular main flow pipe 7 which are arranged above the transition structure 2. The outer sides of the water inlet annular dry flow pipe 4 and the water outlet annular dry flow pipe 7 are respectively provided with a water inlet pipe 5 and a water outlet pipe 8 which are correspondingly communicated with the water inlet annular dry flow pipe and the water outlet annular dry flow pipe.
The cooling sleeve main body 1 is a cylindrical structure with a certain wall thickness, the cross section of the cooling sleeve main body is a circular ring, the transition structure 2 is a shorter cylindrical structure with the same wall thickness, and the size of the circular ring of the cross section of the transition structure is consistent with that of the circular ring of the cross section of the cooling sleeve main body 1.
The cooling sleeve main body 1 is annularly and uniformly processed with an even number 2N of holes (N is the number of the water inlet branch pipes 3/the water outlet branch pipes 6), the diameters of the holes are smaller than the difference between the inner diameter and the outer diameter of the cooling sleeve main body 1 (the wall thickness of the cooling sleeve main body 1). The holes are divided into water inlet holes and water outlet holes which are arranged alternately, namely N water inlet holes and N water outlet holes are arranged at intervals. The water inlet hole extends downwards along the cooling sleeve main body 1 to form a water inlet hole 11, and the water outlet hole extends downwards along the cooling sleeve main body 1 to form a water outlet hole 10.
Evenly process a 2N even number installation through-holes of the diameter unanimous in the hoop on transition structure 2 equally for the installation of the branch pipe of intaking 3 and the branch pipe of play 6 that correspond, the branch pipe of intaking 3 and the branch pipe of play 6 are passed the cooling jacket main part 1 that transition structure 2 and below correspond and are gone up water inlet 11 and apopore 10 intercommunication.
As shown in fig. 3, the inlet hole 11 and an adjacent outlet hole 10 are communicated with each other inside the lower end of the cylinder of the cooling jacket main body 1, and a local cooling water inlet and outlet double-hole loop 12 is formed by the outlet holes 10 along the inlet hole 11, passing through the communicating part inside the lower end of the cylinder, and the number of the inlet holes/outlet holes is N, so that N parallel double-hole loops 12 are provided on the cooling jacket main body 1.
Pore wall spiral ribs 10 are arranged on the inner wall surfaces of the water inlet holes 11/the water outlet holes 10, the distortion ratio (the ratio of lead to diameter) of the number of the pore wall spiral ribs 10 ranges from 2 to 5, the preferred range is 3, the radial thickness range of the ribs is 0.1 to 0.4mm, the preferred range is 0.2mm, and the ribs are uniformly distributed on the inner wall of the hole in the annular direction.
The diameter of the installation through hole on the transition structure 2 can be processed to be gradually changed to form a gradually changed through hole, the diameter of the large end of the installation through hole is the same as that of the hole below the installation through hole, and the diameter of the small end of the installation through hole is the same as that of the water inlet branch pipe 3/the water outlet branch pipe 6.
N water inlet branch pipes 3 are evenly distributed in the annular water inlet dry flow pipe 4 ring direction through the water inlet pipe 5, and are respectively connected with the water inlet hole of the cooling sleeve main body 1 in a corresponding mode, the water inlet branch pipes 3 are communicated with the annular water inlet dry flow pipe 4, the water inlet pipe 5 of the annular water inlet dry flow pipe 4 is connected with an external water pipe system, a complete water inlet pipeline is formed, and the radial position of the water inlet pipe 5 is the middle of two adjacent water inlet branch pipes 3.
The water outlet pipeline and the water inlet pipeline are arranged in a consistent manner, and the water inlet branch pipe 3 and the water outlet branch pipe 6 are arranged at intervals. The plane of the water outlet annular dry flow pipe 7 is parallel to the plane of the water inlet annular dry flow pipe 4, the circle centers are at a certain distance, and the diameters of the rings are different. The water outlet pipe 8 and the water inlet pipe 5 are arranged on the ring direction with an angle of 180 degrees.
The material of the cooling sleeve main body 1 is selected from low-activity high-strength stainless steel; the cooling sleeve main body 1 selects twelve pore channels which are circumferentially and uniformly distributed, namely the sum of the water inlet hole 11 and the water outlet hole 9, to form six parallel double-hole loops, the water inlet hole 11 and the water outlet hole 9 in each double-hole loop are connected through a communication domain at the tail end of each hole to form a double-hole loop 12, wherein the inner wall of each hole is provided with four circumferentially and uniformly distributed hole wall spiral ribs 10;
the hole at the upper end of the cooling sleeve main body 1 is connected with the lower end (large-aperture end) of the installation through hole of the transition structure 2 through high-temperature vacuum brazing; the water inlet/outlet branch pipes 3\6, the water inlet/outlet annular dry flow pipes 4\7 and the water inlet/outlet pipes 5\8 form an integral water inlet/outlet pipeline through high-temperature vacuum brazing, then the six water inlet branch pipes 3 and the six water outlet branch pipes 6 are respectively connected to the upper end (small-aperture opening end) of the transition structure 2 through high-temperature vacuum brazing, and the included angle between the central lines of the water inlet pipe 5 and the water outlet pipe 8 is 150 degrees. I.e. to form a complete small-sized annular cooling structure suitable for use in a cascaded arc ion source.
When the cooling sleeve works, strong plasma flow can be introduced into the cooling sleeve under the action of an external magnetic field, then the inner wall of the cooling sleeve main body 1 bears high heat load, the energy can be transferred to cooling water continuously introduced into the water inlet hole 11 of the cooling sleeve main body 1 in a heat transfer mode, and then the cooling water takes away the heat through the water outlet hole 9, so that the cooling sleeve main body 1 is cooled to ensure that the cascade arc ion source operates in a normal working environment.
Claims (10)
1. A small-size annular cooling structure suitable for a cascade arc ion source comprises a cooling sleeve main body (1), a water inlet annular dry flow pipe (4) and a water outlet annular dry flow pipe (7), wherein the water inlet annular dry flow pipe (4) and the water outlet annular dry flow pipe are arranged above the cooling sleeve main body (1) and are communicated with a cooling channel of the cooling sleeve main body; the method is characterized in that: the cooling sleeve main body (1) is of a cylindrical structure, the cylinder wall has a certain thickness, 2N cooling channels are arranged in the cylinder wall along the vertical direction of the cylinder wall, the cooling channel comprises N water inlet holes (11) and N water outlet holes (10), the water inlet holes (11) and the water outlet holes (10) are arranged at intervals, the water inlet annular dry flow pipe (4) is communicated with the water inlet holes (11), and the water outlet annular dry flow pipe (7) is communicated with the water outlet holes (10); the water inlet hole (11) is communicated with the adjacent water outlet hole (10) in the inner part of the lower end of the cylinder body of the cooling sleeve main body (1), namely N communicating parts are arranged at the lower end of the cylinder body of the cooling sleeve main body (10), and the adjacent water inlet hole (11) is communicated with the water outlet hole (10).
2. A small-scale annular cooling structure suitable for use in a cascaded arc ion source, as claimed in claim 1, wherein: the inner wall surfaces of the water inlet holes (11)/the water outlet holes (10) are all provided with hole wall spiral ribs (10) which are uniformly distributed on the inner wall surface of the hole in a circumferential direction.
3. A small-scale annular cooling structure suitable for use in a cascaded arc ion source, as claimed in claim 2, wherein: the twist ratio of the number of the spiral ribs (10) on the hole wall is 2-5, and the radial thickness of the ribs is 0.1-0.4 mm.
4. A small-scale annular cooling structure suitable for use in a cascaded arc ion source, as claimed in claim 1, wherein: a transition structure (2) is arranged above the cooling sleeve main body (1), 2N mounting through holes are formed in the transition structure, and N water inlet branch pipes (3) and N water outlet branch pipes (6) are arranged at the mounting through holes at intervals; the water inlet branch pipe (3) is communicated with a water inlet annular main flow pipe (4) above the water inlet branch pipe, and the water outlet branch pipe (6) is communicated with a water outlet annular main flow pipe (7) above the water outlet branch pipe; the water inlet branch pipe (3) is communicated with a water inlet hole (11) of the cooling sleeve main body (1) below, and the water outlet branch pipe (6) is communicated with a water outlet hole (10) of the cooling sleeve main body (1) below.
5. The small-scale annular cooling structure for a cascaded arc ion source of claim 4, wherein: the water inlet branch pipe (3) and the water outlet branch pipe (6) are bent pipes which are bent outwards, and the height position of the water inlet branch pipe (3) is greater than that of the water outlet branch pipe (6).
6. The small-scale annular cooling structure for a cascaded arc ion source of claim 4, wherein: the inner diameter of the installation through hole on the transition structure (2) is gradually changed to form a gradually changed through hole, the diameter of the large end of the installation through hole is the same as the diameter of the water outlet hole (10)/the water inlet hole (11) below the installation through hole, and the diameter of the small end of the installation through hole is the same as the inner diameter of the water inlet branch pipe (3)/the water outlet branch pipe (6).
7. A small-scale annular cooling structure suitable for use in a cascaded arc ion source, as claimed in claim 1, wherein: the outer sides of the water inlet annular dry flow pipe (4) and the water outlet annular dry flow pipe (7) are respectively provided with a water inlet pipe (5) and a water outlet pipe (8) which are correspondingly communicated with the water inlet annular dry flow pipe and the water outlet annular dry flow pipe.
8. A small-scale annular cooling structure suitable for use in a cascaded arc ion source, as claimed in claim 7, wherein: the water outlet pipe (8) and the water inlet pipe (5) are annularly and upwardly distributed at an angle of 150-180 degrees.
9. A small-scale annular cooling structure suitable for use in a cascaded arc ion source, as claimed in claim 1, wherein: the plane of the water outlet annular dry flow pipe (7) is parallel to the plane of the water inlet annular dry flow pipe (4), and the circle center is away from the center by a certain distance.
10. A small-scale annular cooling structure suitable for use in a cascaded arc ion source, as claimed in claim 1, wherein: the cooling sleeve main body (1) ring evenly is equipped with six inlet holes (11) and six apopores (9), constitutes six parallelly connected diplopore return circuits altogether.
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